Looking at the diagram with the Crystal's course plotted out, my thoughts are that the destroyer and the Crystal encountered one another at the point between arrows 3 and 4 where the course changes about 90 degrees right. Assume the destroyer is moving slowly on a path that leads to an intersection point further on after the Crystal turns back 90 degrees left and gradually turning right until between arrows 6 and 7 where it deviates more right until it turns some left again between arrows 7 and 8. That dogleg maneuver would have taken the Crystal away from the destroyer with the destroyer also moving apparently away and ahead of Crystal. So the Crystal moves ahead at speed to intersect the path of the destroyer from behind at the point where Crystal’s course changes just before arrow 7. The damage to the Crystal's bow, to include the horizontal tear in the bow, indicate the ship was moving faster than was safe at that hour of night. Initial news reports state Crystal circled back to see if the other boat was okay. Then moved on. That would explain the u-turn et al from arrows 8 on to 10. Also reported was that comm was limited and little maneuver power was available to the destroyer due to extreme bridge damage. So a tug was dispatched to render aid.
My gut says the person ‘driving’ the Crystal deliberately attacked from behind in a way meant to cripple and sink the destroyer.
